AHCAL – Electromechanical Integration EUDET annual meeting – Paris8.-10. Oct. 2007 M. Reinecke.
AHCAL Electronics. SPIROC2 and HBU measurement results Mathias Reinecke CALICE main meeting Univ....
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Transcript of AHCAL Electronics. SPIROC2 and HBU measurement results Mathias Reinecke CALICE main meeting Univ....
AHCAL Electronics.SPIROC2 and HBU measurement results
Mathias Reinecke CALICE main meetingUniv. HASSAN II, Casablanca, MoroccoSept. 23rd, 2010
Mathias Reinecke | CALICE meeting Casablanca | Sept. 23rd, 2010 | Page 2
Outline
> Setup Electronics for Charge Injection
> SPIROC2 measurement results
Compensation capacitors
HOLD Scans, Dynamic Range
Autotrigger / Testbeam / MIP Efficiency
Rate Dependency
> Results from LED system
> Outlook
> Conclusions
Mathias Reinecke | CALICE meeting Casablanca | Sept. 23rd, 2010 | Page 3
Charge Injection Setup I – HBU_I in laboratory
Looks like an easy setup, but ….
Mathias Reinecke | CALICE meeting Casablanca | Sept. 23rd, 2010 | Page 4
Charge Injection Setup II
HBU has not been designed for charge-injection tests!Initial idea: Analogue SPIROC tests => LAL testboards, HBU => tests of digital part / readout chain / DAQ / system (SiPMs)
Due to new effects: HBU is used for analogue tests as well…
SiPM termination @ SPIROC2 input
Mathias Reinecke | CALICE meeting Casablanca | Sept. 23rd, 2010 | Page 5
SP2 PA compensation capacitors
Problem: Cell dependent amplitude
Amplitude decay in first LG memory cells
HG histogram‘bleeds out’ to the left
correct position
Effect cannot be eliminated as at LAL by a high blocking-cap on VDDD2 (R. Honda)
Effect = f(amplitude, input signal shape, PA comp. caps)Effect != f(trigger rate, block-caps@100µF)
HG PA=100fF, LG PA=200fF50 ns shaping, ext. Hold/Trig.hold-time=95ns (LG), 130ns (HG)Charge Injection with 5ns risetime.No PA compCs
Mathias Reinecke | CALICE meeting Casablanca | Sept. 23rd, 2010 | Page 6
SP2 PA compensation capacitors
Holdscan w/o compensation capacitors (CompC)
compensation caps change input signal shape….
HG PA=100fF, LG PA=200fF50 ns shaping, ext. Hold/Trig.Charge Injection with 2ns risetime.
Mathias Reinecke | CALICE meeting Casablanca | Sept. 23rd, 2010 | Page 7
SP2 PA compensation capacitors
Dynamic Range HG and LG
HG
LG, no compC
LG, with compC
HG PA=100fF, LG PA=200fF50 ns shaping, ext. Hold/Trig.Charge Injection with 2ns risetime.
CompCs improve severely cell uniformity,CompCs increase HG dynamic range,CompC=3pF still not large enough for very fast signals
=> Input signal shape changes amplitude.
Mathias Reinecke | CALICE meeting Casablanca | Sept. 23rd, 2010 | Page 8
SP2 Holdscans
Problem: Position of Hold-Maximum depends on signal amplitude. Position is different for HG and LG
By Mark Terwort, Mathias Reinecke
Compensation capacitors do not improve this behaviour.HG PA=100fF, LG PA=200fF50 ns shaping, ext. Hold/Trig.Charge Injection with 2ns risetime.No PA compCs
Mathias Reinecke | CALICE meeting Casablanca | Sept. 23rd, 2010 | Page 9
SP2 Holdscans
Problem: Position of Hold-Maximum depends on preamp. setting (left) and varies from ASIC to ASIC (right)
By Jeremy Rouene
Charge Injection with 5ns risetime.50ns shaping, ext. Hold/TrigNo PA compCs
ASIC1 ASIC2
Mathias Reinecke | CALICE meeting Casablanca | Sept. 23rd, 2010 | Page 10
SP2 Rate dependency
Injected Charge: 10.47pC (LG)
Good behaviour at small signals:-no discharge of analogue memory-no rate dependency
Fairly good behaviour at large signals:-no discharge of analogue memory-low rate dependency in last mem.-cells-amplitude decay in first mem.-cells
HG PA=100fF, LG PA=200fF50 ns shaping, ext. Hold/Trig.hold-time=95ns (LG),Charge Injection with 5ns risetime.No PA compCs
Mathias Reinecke | CALICE meeting Casablanca | Sept. 23rd, 2010 | Page 11
DESY Testbeam – ext. Trig vs. Autotrigger
black curve:ASIC triggers itself(autotrigger)
threshold
Results byJeremy Rouene
MIP peak
Set threshold to:-minimize noise hits-maximize MIP detection efficiency
Mathias Reinecke | CALICE meeting Casablanca | Sept. 23rd, 2010 | Page 12
Autotrigger MIP efficiency
A MIP efficiency of ~95% can be achieved for a threshold-pedestal- cut at 10^(-4) for most channels (autotrigger mode).
See more results in the report:‘Analysis of the autotrigger of the read out chip of the front-end electronics for the HCAL of the ILC.’ (Hamburg, Aug. 2010)by Jeremy ROUENE
Mathias Reinecke | CALICE meeting Casablanca | Sept. 23rd, 2010 | Page 13
SP2 autotrigger threshold definition
~172 DACtics / pC (ASIC1)~182 DACtics / pC (ASIC2)
pedestal 2.5 MIP (1.602pC)
by charge injection…by testbeam…
(8pixels and 350ADCcounts per MIP, SiPM gain of 5*10^5)
~191 DACtics / pC (chn 8)~120 DACtics / pC (chn 33)
Spread: Channel-wise threshold adjustment necessary!Results byJeremy Rouene
~ok!
Mathias Reinecke | CALICE meeting Casablanca | Sept. 23rd, 2010 | Page 14
LED Calibration Systems II – DESY + Uni Wuppertal
> LED uniformity under investigation
> Wuppertal recommended new LED driving circuit and new LED type with lower spread in output.
> HBU2 will contain solder parameter field in order to adjust LED power per channel.
> Problems: LED light output spread, dynamic range (saturation)
LED 1 Cent
Mathias Reinecke | CALICE meeting Casablanca | Sept. 23rd, 2010 | Page 15
LED Calibration System – Current Activities
green: good single-pixel spectrumred: SiPM does not show single-pixelsblue: LED or SIPM dead(to be analyzed …)
SPIROC2_2 SPIROC2_1HBU-wide charact. ofSiPM single-pixel spectra
Development of:Automatic FIT andgain extraction routines(here: for testbeam MIP signals)
Results byJulian Sauer
Mathias Reinecke | CALICE meeting Casablanca | Sept. 23rd, 2010 | Page 16
Next important steps (the last two big points):
SPIROC2 TDC characterization
SPIROC2power pulsing
first results already there….
DIF firmwareneeds update…
autotrigger!
HG PA=100fF, LG PA=200fF50 ns shaping, ext. Hold/Trig.hold-time=130ns (HG/TDC),Charge Injection with 5ns risetime.No PA compCs
Mathias Reinecke | CALICE meeting Casablanca | Sept. 23rd, 2010 | Page 17
Conclusions and Outlook
> Ongoing system tests are important, but delay redesigns as well.
> Current effects should be visualized by SPIROC2 simulations (LAL).
> Studies from R. Honda at LAL show very similar effects => origin SPIROC2 ?
> Not much activity on DIF/DAQ development at DESY currently.